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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.3.3.14"></a>Control value's assignment to various objects</h2></div></div></div>
<p>
      <span class="application">Libgda</span> has builtin support to allow the programmer to control what values are acceptable 
      for some objects which hold values (namely the <a class="link" href="GdaHolder.html" title="GdaHolder">GdaHolder</a>,
      <a class="link" href="GdaSet.html" title="GdaSet">GdaSet</a> and <a class="link" href="GdaDataProxy.html" title="GdaDataProxy">GdaDataProxy</a> objects).
      For more information about this topic, see the <a class="link" href="data_models.html#data-validation" title="Custom data validation">custom data validation</a>
      section.
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